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Table 1 Distance drifted and time from release to last recorded movement in the entire tracking period for groups of dead Atlantic salmon smolts and European silver eels tagged with radio transmitters and released in three German rivers, related to water discharge at release

From: Movements of dead fish in rivers

Species

River

Release site

Release date

Number of fish

Total distance (km) drifted during entire study period

Mean (min–max, SD, median)a

Time (days) from release to last recorded downstream movement

Mean (min–max, SD, median)b

Water discharge (m3 s−1) at release

Distance (km) drifted during first period after release

Mean (min–max, SD, median)

Period length (days)

Water discharge (m3 s−1) in period after release

Mean (min–max, SD, median)

Salmon

Sieg

Tailrace

9 Apr 15

10

1.3 (0.1–2.4, 0.7, 1.5)

3.2 (1.6–4.5, 1.6, 4.5)

20.2

1.3 (0.1–2.4, 0.7, 1.5)

24

9.5 (5.5–20.2, 3.6, 8.8)

Salmon

Sieg

Tailrace

16 Apr 15

10

0.9 (0.1–1.9, 0.6, 0.9)

9.0 (1.7–22.7, 7.9, 6.7)

9.9

0.9 (0.1–1.9, 0.6, 0.8)

21

8.0 (5.5–15.7, 2.1, 7.6)

Salmon

Kinzig

On turbine

13 Apr 15

10

0.05 (0–0.2, 0.1, 0)

13.5 (1.7–25.7, 12.6, 12.7)

21.0

0.03 (0–0.1, 0.05, 0)

24

27.5 (11.0–120.0, 22.8, 17.0)

Salmon

Kinzig

On turbine

18 Apr 15

10

0.03 (0–0.1, 0.05, 0)

7.4 (0.5–22.8, 10.0, 0.5)

17.0

0.0 (0–0, 0, 0)

23

29.7 (11.0–120.0, 24.0, 17)

Salmon

Diemel

Archimedes

10 Apr 15

10

0.5 (0.4–1.1, 0.3, 0.4)

1.5 (0.04–11.2, 3.4, 0.5)

15.5

0.6 (0.4–1.1, 0.4, 0.4)

22

10.8 (8.3–15.5, 2.0, 10.6)

Salmon

Diemel

Archimedes

15 Apr 15

10

0.3 (0.1–0.7, 0.2, 0.2)

2.6 (0.2–9.5, 3.4, 0.5)

12.5

0.3 (0.1–0.7, 0.2, 0.15)

23

9.6 (7.6–13.6, 1.3, 9.3)

Eel

Sieg

Tailrace

8 Oct 14

5

13.3 (2.7–21.1, 7.7, 14.6)

27.9 (0.8–54.8, 31.0, 28.1)

14.1

11.7 (2.7–15.1, 6.0, 14.4)

55

20.0 (7.1–81.2, 13.1, 14.3)

Eel

Sieg

Tailrace

10 Oct 15

10

7.5 (1.1–19.7, 6.4, 5.8)

41.9 (9.6–107.6, 26.4, 41.6)

5.5

7.1 (1.1–19.7, 6.5, 4.1)

60

31.7 (3.4–227.0, 47.0, 5.8)

Eel

Sieg

Tailrace

13 Oct 15

10

8.2 (0.1–15.4, 5.8, 9.45)

34.5 (1.7–43.7, 17.4, 43.7)

4.1

7.7 (0.1–15.4, 6.0, 8.4)

59

32.8 (3.4–227.0, 47.0, 6.2)

Eel

Sieg

Tailrace

21 Nov 15

5

5.8 (0.0–18.5, 7.3, 2.8)

28.8 (0.03–66.0, 29.3, 20.0)

74.7

5.4 (0–16.5, 6.5, 2.8)

59

52.6 (17.4–227.0, 41.4, 39.0)

Eel

Sieg

Spillway gate

21 Nov 15

5

6.2 (1.9–12.9, 4.8, 3.7)

14.8 (0.03–59.1, 24.8, 5.0)

74.8

5.0 (1.9–9.5, 4.0, 3.7)

59

52.6 (17.4–227.0, 41.4, 39.0)

Eel

Kinzig

On turbine

12 Oct 15

5

13.0 (0.7–30.1, 12.4, 10.5)c

44.2 (39.2–58.9, 9.8, 39.4)c

3.7

12.8 (0.1–30.1, 12.6, 10.5)c

59

11.2 (2.7–141.0, 18.0, 3.5)

Eel

Kinzig

On turbine

21 Nov 15

5

17.7 (7.0–30.1, 11.6, 13.6)c

10.9 (8.4–18.8, 4.4, 9.0)c

32.0

17.7 (7.0–30.1, 11.6, 13.6)c

19

24.8 (9.4–141.0, 23.3, 16.0)

Eel

Diemel

Tailrace

9 Oct 14

5

1.2 (0.4–2.9, 1.1, 0.5)

24.4 (2.6–54.6, 27.6, 6.6)

11.4

1.3 (0.5–2.3, 0.9, 1.2)

55

8.1 (5.8–14.7, 1.5, 7.8)

Eel

Diemel

Archimedes

9 Oct 14

5

1.8 (0.2–5.1, 2.0, 1.2)

39.5 (5.8–54.6, 22.1, 54.6)

11.4

0.7 (0.1–1.3, 0.6, 0.7)

55

8.1 (5.8–14.7, 1.5, 7.8)

  1. Distance drifted in the first period after release is also included, i.e., during approximately the first 3 weeks for Atlantic salmon and first 2 months for European silver eels (exact length of period is given and varies among groups due to differences in tracking dates), in relation to water discharge during that period. Fish taken by scavengers are not included in drift in the first period after release. Data on water discharge were obtained from Schwaibach gauging station in River Kinzig (1.9 km upstream of Gengenbach power station), from Haeuda weir in River Diemel (5.4 km downstream of Kuhlemühle power station) and from Unkelmühle power station in River Sieg
  2. aFor scavenged fish or fish with an uncertain fate, this is based in maximum distance drifted before they disappeared or moved upstream
  3. bTime from release to the tracking survey preceding the tracking survey when the fish were recorded on their most downstream position
  4. cMean, median and max are minimum numbers, because the eels were not followed downstream of the confluence with the Rhine (30.1 km downstream)
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Animal Biotelemetry

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